Hello all, am new member with 2018 Ram ecodiesel. Code is cold start exhaust temp to low. Even at 80deg. They replaced exhaust sensor, light on again after a week. Then they replaced PCM and checked harness. Light on again. Same code. Then they installed data retrieval box in OBD port. Waiting near 2 weeks to hear back from FCA tech support. Dealer can do nothing more. No other performance issues. Anyone have similar issues? Thanks.